AAS 205th Meeting, 9-13 January 2005
Session 54 Pulsating Stars: RR Lyraes, Miras, Cepheids, etc.
Poster, Tuesday, January 11, 2005, 9:20am-6:30pm, Exhibit Hall

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[54.02] Metallicity of Galactic Bulge RR Lyrae

A.M. Kunder, B. Chaboyer (Dartmouth College), P. Popowski (Max-Planck Institute fuer Astrophysik), S. Nikolaev, K. Cook (Lawrence Livermore National Laboratory)

Metallicities of approximately 3500 RR Lyrae stars towards the Galactic bulge from the MACHO Survey bulge fields are presented. These metallicities are based upon a empirically calibrated relationship between the Fourier decomposition of the light curve and [Fe/H]. We find the RRab stars from the MACHO bulge fields associated with Sagittarius dwarf galaxy have a lower average metallicity than the RRab Lyrae stars associated with the Galactic bulge. We investigate the dispersion of the metallicity in the bulge RRab Lyrae stars and the correlation between metallicity and the location of the stars within the bulge.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.